Harrow Hill is an archaeological site in West Sussex, England.

There is Neolithic flint mine, and a Martin Down style enclosure of the Bronze Age.

The southern part of the area, where there is hummocky ground, is thought to show a slightly different period of mining.

There had been some exploitation of upper levels of flint, and there were six radiating galleries at the bottom of the pit.

The flint mine at Cissbury, about 3.7 miles (6.0 km) to the south-east, dates from about the same time.